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Why is there a difference in the solution and convergence pattern for an interference fit model between solving in static vs transient cases when they both use the same mesh, contact settings and time step?

- June 5, 2023 at 7:05 am
  
  FAQ
  Participant
  
  In interference fit, you are modeling the component installation step to create a pre-stress state, which is a static scenario, which is why it works well in a static analysis. In the case of a transient analysis, you add two additional terms to the governing equations to account for the inertial effects. As a result, while the solver is trying to resolve the interference step, a stress wave is travelling back and forth inside the material which makes it unstable and hence causes trouble with convergence. While solving a multi-step transient analysis where the first step is to generate the pre-stress condition by resolving the interference, the recommended way is to do this in transient analysis but turn off the time integration in step 1 so that the interference step is solved as a static case. You can find the option to turn off the time integration under Analysis Settings. Also, issue the following command to ramp all the loads in this step. KBC,0

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